Confessions of a Liberal Puritan

I will keep an eye out for any data. If you're unfamiliar with manga, you may wish to consider Ranma 1/2 and its imitators. The eponymous hero has been cursed so that when cold water is poured on him, he turns into a girl (and turns back into a boy when submerged in hot water). Much romantic and martial art shenanigans ensue in a high school setting. The story also includes a number of violent, strong women. Has something of a fanfic following as well, although I've not read any.

I've read at least one imitator, Funtaba-kun Change, where Funtaba changes sex whenever aroused. He/she is not cursed though: it's a genetic trait that both her/his parents share. More high school hi-jinks and a wrestling club here.

I'm not sure what help this might be to you, but I find it interesting that male readers are encouraged to read about a boy who sometimes gets to be a girl too.